Furnace and drum therefor.



J. BOLGIANO. FURNACE AND DRUM THEREFOR.

APPLICATION FILED JULY 10, 1912.

Patented Mar. 25, 1913.

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FURNACE AND DRUM THEREFOR. APPLIOATION FILED JULY 10, 1912.

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J. BOLGIANO.

FURNACE AND DRUM THEREFOR.

APPLICATION FILED JULY 10, 1912.

Patented Mar. 25, 1913.

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tlNITED STATES PATENT oriuon.

JOHN BOLGIANO, OF BALTIMORE, MARYLAND, ASSIGNOB TO THE AMERICAN FURNACE DEVICE 00., OF BALTIMORE, MARYLAND, A CORPORATION OF DELAWARE.

FURNACE AND DRUM THEREFOR.

To all whom it may concern Be it known that 1, JOHN BOLGIANO, a citi zen of the United States, residing at Baltimore, in the State of Maryland, have invented new and useful Improvements in Furnaces and Drums Therefor, of which the following is a specification,

This invention relates to furnaces, and has particular reference to an improved furnace structure wherein heated air is fed to the fire-chamber for the purpose of promoting the combustion of the smoke and furnace gases to thereby effect the more complete burning of the fuel, a reduction in the relative amount of ashes, and the consequent economy in the use of the fuel; practically eliminating the smoke and abating the smoke nuisance; and obtaining in general, an increased efliciency in the operation and erection of the furnace.

For obtaining the above, and other more or less important results, the furnace of this invention contemplates the use of a peculiarly formed drum or water-back constituting a flue feeding the air to the fire-chamber, and heating the air during its passage through the flue to further promote the oom bustion of the smoke and furnace gases.

Various other objects and advantages of this invention will be apparent from the specific disclosure of the present embodiment of the invention hereinafter described and shown in the accompanying drawings in which:

Figure 1 is a longitudinal sectional view of the improved furnace; Fig. 2 is a trans verse section of the same taken forwardly of the bridgewall and looking toward the bridge-wall; Fig. 3 is a top plan view of the bridge-wall showing the drum in position; Fig. 4 is an isometrical perspective View of the drum looking toward the inner side of the same; Fig. 5 is a bottom plan view of the drum; Fig. 6 is a central transverse section of the drum; Fig. 7 is a similar view showing a slight modification of the drum; Fig. 8 is a transverse section of the furnace forwardly of the bridge-wall, showing a slight modification in the bridge-wall structure; Fig. 9 is a section of the lower end of the drum showing a modified form of foot therefor; Fig. 10 is a rear face elevation.

of the drum, reduced, showing a friction grating in the air flue of the drum; Fig. 11 is a detail plan view of the friction grating.

Specification of Letters Patent.

Application filed July 10, 1912.

Patented Mar. 25, 1913.

Serial No. 708,600.

Referring to the drawings, in which like characters designate similar parts throughout the several views, and referring particularly to Figs. 1, 2 and 3, 10 designates the side walls of the furnace, 11 the rear wall, and 12 the front plate or wall. lVithin the walls, and spaced rearwardly from the front wall in the usual manner is a bridge-wall 13 forming with the front wall 12 the usual fire-chamber and ashpit separated by a grate 14 of any approved construction and mounted in any adaptable manner. The bridgewall 13 rises to a point in proximity to the lower side of a boiler 15 suitably mounted within the furnace. The bridge-wall 13 is recessed in its front side and from its top to a point considerably below the grate and is provided with a supporting plate 16 extending transversely of the furnace entirely across the same for supporting a drum 17, the details of which will be hereinafter pointed out. In the preferred embodiment of this invention, the plate 16 projects forwardly from the outer face of the drum 17 to support a foot 18, of fire-brick or the like, located at the lower end of the drum 17 and adapted to hold the ashes and fuel from passing down between the drum 17 and the grate 14, and for preventing, to a considerable extent, the passage of air from the ashpit up between the drum and the grate. The lower end of the recess in the bridgewall 13 which communicates with the ashpit is opened or closed to the ashpit by a damper 19 preferably comprising a door hinged at its upper edge and normally hanging down against the forward side of the bridge-wall to close the lower end of the recess, the door 19 having hinged connection with a rod 20 extending forwardly through the ashpit and through the front plate 12 to enable the fireman to regulate the opening and closing of the damper. Any suitable damper may be employed, the present showing being but one illustration of the same which effectually controls the passage of air from the ashpit into the recess in the bridgewall. In this instance, the rod 20 is provided with ratchet teeth 21 in its underside cooperating with a fixed dog or lip 22 carried upon the front plate 12 for holding the rod in position when adjusted.

Referring particularly to Figs. 4, 5 and 6, the drum 17 is shown in the form of a flat body tapering toward one side and provided at its ends with wings or projections 23 extending laterally from one side of the drum 17 and converging toward the reduced edge of the drum. The drum is preferably reinforced by a number of rivets 24 passing transversely through the same to strengthen the drum against lateral pressure. At the ends of the body of the drum threaded openings 25 are provided for the reception of pipes 26 leading from the top of the drum to the boiler 15, a valve 27 being located in the pipe 26 for controlling communication between the boiler and the drum. The lower end of the drum is connected in any suitable manner to the feed water pipe 28 passing into one side of the furnace into the bridge-wall and up through the same to the bottom of the drum, as shown in Figs. 1 and 2. It will of course be understood that the specific arrangement of the pipes 26 and 27 is immaterial and that any arrangement may be had which is found desirable to meet the conditions of the furnace installation.

From Figs. 1 and 3 it will be noted that the drum 17 rests upon the plate 16 with its wings or projections 23 extending toward the inner face of the bridge-wall within the recess and that a flue is provided between the inner face of the drum 17, the downwardly converging wings 23, and the rear portion of the bridge-wall 13. Although the drum 17 is disclosed as having downwardly sloping ends with correspondingly sloping wings it will be understood that the drum may be made with. ends lying in parallel or other planes and correspondingly positioned wings. The flue thus formed at the back of the drum 17 opens downwardly into the recess of the bridgewall and thereby communicates with the ashpit. The damper 19 regulates the flow of air from the ashpit into the flue. The air entering the bridgewall from the ashpit passes up beneath the wings and the drum and is heated while passing through the flue. The air when heated expands, and the upwardly flaring flue formed at the back of the drum permits of the expansion of the air without causing any back pressure of the same in the bridge-wall or limiting the draft of air up through the flue. The drum 17 preferably has its upper edge flush with the upper edge of the bridge-wall so that the air passing from the flue is brought into direct contact with the smoke and furnace gases passing over the bridge-wall. By this peculiar arrangement the air is delivered to the unoxidized products of combustion in its highest heated state, and across practically the entire width of the furnace. The damper 19 may be regulated to control the passage of the air from the ashpit into the flue.

The foot 18, disclosed in Figs. 1, 2 and 3 as composed of a low wall of fire-brick, may

be made any height desired, as for instance such as shown in Fig. 8 wherein the wall 18 extends up to the top of the drum and completely closes the same from the fire-chamber, thus protecting the drum from direct contact with the fire.

If preferred, the drum 17 may be provided with an integral foot 18 overlapping the grate in the same manner as the foot 18, the foot 18'" being shown to advantage in Fig. 7. The drum 17 is preferably closed in at its ends with fire-brick, as shown in Figs. 2 and 3, and the pipes 26 leading from the top of the drum are also preferably protected by extending the bridge-wall up about the same at the sides of the furnace.

In Fig. 9 of the drawings is disclosed another form of foot which may be applied to the lower-end of the drum 17. In this instance the foot 18 is disclosed in the form of a flanged plate extending outwardly from the 'foot and having its flange riveted or otherwise suitably secured to the front face of the drum. The foot 18 is provided for overlapping the grating and closing the space between the drum and the grate. If desired, the fire-brick wall may be built up upon the foot 18, as disclosed in Fig. 1.

For the purpose of thoroughly heating the air passing up through the flue of the drum a friction grating 29 is placed within the flue in a horizontal position. This friction grating 29 is disclosed in the present instance as comprising a flat plate having slightly spaced transverse slots extending throughout practically the entire length of the plate and adapted to provide passages for the air fed up through the flue. 1 This structure is disclosed in the plan View of Fig. 11.

Fig. 10 of the drawings discloses the friction grating in position in the flue of the drum in which the grating 29 is fitted down in between the wings 23 and the body of the drum 17 and is of a length slightly greater than the length of the lower end of the flue, and the grating is provided with beveled ends so that it will wedge down in the flue and be supported by the laterally extending wings 23. This grating 29 is heated by contact with the drum and by reason of its position in the bridge wall of the furnace, so that the air which passes up through the flue is brought into contact with the cross bars of the grating and is thereby thoroughly heated and stirred as it passes up through the flue. It is found that this grating greatly increases the temperature of the air, and effects a uniformity of the temperature throughout the body of the air passing up through the flue.

What I claim is:

1. In a furnace a bridge-wall having a recess in its front face extending through the top thereof, a supporting plate extending across the recess intermediate the upper and lower ends of the recess, a hollow drum mounted upon the supporting plate in the recess and having spaced rearwardly extending wings providing a flue therebetween, and means mounted on the bridge wall below the drum adapted to control the passage of air up through the recess and the flue.

2. In a furnace, a bridgewall having a recess in its front face between its ends and extending from the top to near the bottom of the wall, a drum arranged in the recess above the bottom thereof and having lateral projections providing a flue between the projections and the drum within the recess, and a damper arranged at the lower end of the recess beneath the drum adapted to control the flow of air into the recess and the flue.

3. In a furnace, a bridge-wall having a recess in one side extending near to the ends of the wall and from the top to a point near the bottom of the wall, a supporting plate mounted on the bridge-wall across and within the recess below the upper edge of the wall, a drum seated upon said supporting plate within the recess and having spaced projections extending backwardly from the drum providing a flue between the drum, the projections, and the inner face of the bridge-wall, and a damper supported upon the bridge-wall at the lower end of the recess whereby to control the flow of air into the recess and the flue.

4-. In a furnace, a bridge-wall, a grate in the furnace having one end in proximity to the bridge-wall, a drum seated in the bridgewall in a plane above the grate, means associated with the bridge-wall admitting air through the bridge wall between the same and the drum, and a fire-brick wall extending across the lower portion of the drum and constituting a foot closing the space be tween the drum and the grate.

5. In a furnace, a bridge-wall, a hollow drum seated in the upper end of the bridge wall and having lateral hollow projections at its ends providing therebetween a flue, a damper mounted upon the lower portion of the bridge-wall controlling the flow of air to the fine, and a foot located at the lower end of the drum and extending slightly beyond the front face of the bridgewall.

6. In a furnace, a bridgewall, a drum mounted in the bridge-wall and having spaced wings providing therebetween a flue, means for admitting air into the flue, and a foot located across the lower end of the drum at its front face.

7. In a furnace structure, a bridge-wall provided with a vertical air passage, means for controlling the flow of air into said passage, a drum seated in the bridge-Wall and adapted to receive heated water, and spaced wings at one side of the drum providing therebetween and with the drum an air flue within said air passage.

8. An air heating drum for furnaces comprising a substantially flat body tapering at its ends from top to bottom and having laterally projecting wings at its ends converging toward the bottom of the body and at one side thereof whereby to provide a vertical upwardly flaring flue at one side of the body.

9. An air heating drum for furnaces comprising an elongated body having its ends converging toward one edge of the body, said body being provided at the converging ends with wings extending late-rally from one side of the body and converging toward said edge of the body whereby to provide a fine at one side of the body flaring toward one edge of the same.

10. In a furnace structure, a drum comprising a hollow fiat body adapted to be positioned in the bridge wall of the furnace, said drum having lateral projections at one side providing therebet-ween a flue for the reception of air to be fed to the furnace, and a friction grating carried by the drum in the flue whereby the air passing through the flue is brought into contact with said friction grating.

11. In a furnace, and in combination, a recessed bridge wall, a hollow water receiving drum seated in the recess and having its ends extending laterally from the body of the drum whereby to provide an air flue therebetween, and a foot supported upon the bridge wall across the other side of the drum adapted to protect the drum and deflect air into said flue.

12. In a furnace, and in combination, a bridge-wall having a recess in its front face, a supporting plate mounted on the bridge wall in the recess and extending slightly beyond the outer face of the bridge-wall, a hollow drum seated upon the supporting plate in the recess and having rearwardly extending wings at its ends communicating with the body of the drum and providing therewith an air receiving flue within the recess, and a foot carried upon the support ing plate against the outer face of the drum.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

JOHN BOLGIANO.

Witnesses JAS. (I. MAWHINNEY, Gnnrnnnn M. STUCKER.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). G. 

